[eridius]

It's only "safest" in that it puts a bunch of restrictions that the original developer hopefully cares about. If the original developer doesn't care about licensing, then they don't care about those restrictions and so having them in place is counterproductive.

GPL is the worst choice because it's basically the most restrictive license I can think of, and it's intentionally viral, which makes GPL-licensed software dangerous to work with (the source of) by anyone who hasn't already bought into the GPL ecosystem.